Is it wrong to say: "I had learnt that long back"? Is it more apt to say "I had learnt that long ago"?

  • 4
    I've never heard the phrase used as "learnt that long back." The closest I've heard is "I learned that a long 'time' back/ago." Of the two choices, your second is better. – Neptunian Dec 11 '15 at 15:54
  • 1
    "a long time ago" or "long ago." "long back" seems to be an Indian-English idiom in my observation. – Jim Dec 11 '15 at 16:02

Using "long ago" is the correct (i.e. commonly heard) term. As seen in this Ngram, "long back" is extremely rare.

Ngram of "long ago" versus "long back"

That's not to say that there aren't some constructions where "long back" might be correct, but it's quite uncommon. As noted in the comments, the sentence "I learned that a long time back/ago" would be acceptable.

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